Overview of the GLASS products

 

The Global Land Surface Satellite (GLASS) Product suite has been expanded from the original five products (Liang, et al., 2013a,b) to the current 14 products: Leaf Area Index (LAI), Broadband Albedo (Albedo), Broadband Emissivity (BBE), Fraction of Absorbed Photosynthetically Active Radiation (FAPAR), Downward Shortwave Radiation (DSR), Photosynthetically Active Radiation (PAR), Net Long-wave Radiation (LWNR), Net Radiation (NR), Land Surface Temperature (LST), Fractional Vegetation Coverage (FVC), Latent Heat Flux (LE), Gross Primary Production (GPP), Snow Cover Extent over the Tibetan Plateau (TPSCE), and Global Aboveground Biomass (AGB). The basic characteristics of these products are listed in the following table.

 


Characteristics

 

 

No.

Product

Spatial Resolution

Temporal Resolution

Temporal Range

1

LAI

1-5km, 0.05º

8 days

1981-2018

2

Albedo

1-5km, 0.05º

8 days

1981-2019

3

BBE

1-5km, 0.05º

8 days

1981-2018

4

FAPAR

1-5km, 0.05º

8 days

1981-2018

5

DSR

0.05º

1 day

2000-2018

6

PAR

0.05º

1 day

2000-2018

7

LWNR

0.05º

Instantaneous

1983,1993,2003,2013

8

NR

0.05º

1 day

2001-2015

9

LST

0.05º

inst, daily, monthly

1981-2000

10

FVC

500m, 0.05º

8 days

1981-2018

11

ET

1-5km, 0.05º

8 days

1981-2018

12

GPP

1-5km, 0.05º

8 days

1981-2017

13

TPSCE

0.05º

1 day

1981-2016

14

AGB

0.01º

1 year

2000-2018

 


The GLASS products have several unique features, for example

1. many of these products span over 35 years -- from 1981 to the present, especially valuable for long-term environmental change studies;

2. the radiation products have the spatial resolution of 5km, much finer than the commonly used products (e.g., CERES, GEWEX);

3. all products are spatially and temporally continuous with no gaps and missing values;

4. The broadband longwave emissivity product is the first product of this kind in the world at 8-day temporal resolution and 1km spatial resolution;

5. the GLASS products have been demonstrated to have high quality and accuracies. They have been widely used.


References

[1].Liang, S., Zhao, X., Yuan, W., Liu, S., Cheng, X., Xiao, Z., Zhang, X., Liu, Q., Cheng, J., Tang, H., Qu, Y.H., Bo, Y., Qu, Y., Ren, H., Yu, K., & Townshend, J. (2013a). A Long-term Global LAnd Surface Satellite (GLASS) Dataset for Environmental Studies. International Journal of Digital Earth, 6, 5-33

[2].Liang, S., Zhang, X., Xiao, Z., Cheng, J., Liu, Q., & Zhao, X. (2013b). Global LAnd Surface Satellite (GLASS) products: Algorithms, validation and analysis. Springer

[3].Liang, S., Cheng, C., Jia, K., Jiang, B., Liu, Q., Xiao, Z., Yao, Y., Yuan, W., Zhang, X., Zhao, X., & Zhou, J. (2020). The Global LAnd Surface Satellite (GLASS) products suite. Bulletin of the American Meteorological Society, DOI: 10.1175/BAMS-D-18-0341.1 [Download]